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A General Method To Coat Colloidal Particles with Silica
Abstract
A general method to coat colloids with silica is described. The amphiphilic, nonionic polymer poly(vinylpyrrolidone) (PVP) was adsorbed to various colloidal particles such as small gold colloids, gold-shell silica-core particles, small and large silver colloids, boehmite rods, gibbsite platelets, and positively or negatively charged polystyrene. After this functionalization the stabilized particles could be transferred to a solution of ammonia in ethanol and directly coated with smooth and homogeneous silica shells of variable thickness by addition of tetraethoxysilane in a seeded growth process. The length of the polymer used strongly influences the stability of the colloids and the homogeneity and smoothness of the initial silica coating. This method is especially useful for colloidal particles that cannot be covered directly with SiO 2 by a Stöber-like growth process. Compared to methods known from the literature for the coating of such particles, this new method is faster and requires neither the use of silane coupling agents nor a precoating step with sodium silicate, which is poorly reproducible.
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Cites
Preparing Monodisperse Metal Powders in Micrometer and Submicrometer Sizes by the Polyol Process
Fievet, F., Lagier, J. P., & Figlarz, M. (1989) · MRS Bulletin · doi:10.1557/s0883769400060930 · Cited by 585
Cited by
Polymer/Silica Nanocomposites: Preparation, Characterization, Properties, and Applications
Zou, H., Wu, S., & Shen, J. (2008) · Chemical Reviews · doi:10.1021/cr068035q · Cited by 2,121
Seh, Z. W., Liu, S., Low, M., Zhang, S., Liu, Z., Mlayah, A., & Han, M. (2012) · Advanced Materials · doi:10.1002/adma.201104241 · Cited by 855
Encapsulated Metal Nanoparticles for Catalysis
Gao, C., Lyu, F., & Yin, Y. (2021) · Chemical Reviews · doi:10.1021/acs.chemrev.0c00237 · Cited by 855
Organic Phase Syntheses of Magnetic Nanoparticles and Their Applications
Wu, L., Mendoza-Garcia, A., Li, Q., & Sun, S. (2016) · Chemical Reviews · doi:10.1021/acs.chemrev.5b00687 · Cited by 601
Tuning Size and Sensing Properties in Colloidal Gold Nanostars
Barbosa, S., Agrawal, A., Rodríguez-Lorenzo, L., Pastoriza-Santos, I., Alvarez-Puebla, R. A., Kornowski, A., Weller, H., & Liz-Marzán, L. M. (2010) · Langmuir · doi:10.1021/la102559e · Cited by 522
Metadata
- Authors
- Graf, C., Vossen, D. L. J., Imhof, A., & van Blaaderen, A.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2003-07-11
- Volume
- 19
- Issue
- 17
- Pages
- 6693-6700
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W4230164597
- Cited by
- 1,175
- References
- 1
- FWCI
- 17.80
- Type
- journal article
- Language
- en
- Open access
- closed
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